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agnathan
This term is primarily used in biological and paleontological contexts to categorize primitive vertebrates. It carries a clinical, scientific register and is rarely encountered outside of zoology or evolutionary biology textbooks.
As a noun, it refers to the organism itself, while the adjective form describes the anatomical features associated with the absence of jaws. Because it describes a specific taxonomic group, it is used with precision to distinguish these creatures from gnathostomes, which are jawed vertebrates.
Meanings
Examples
The lamprey is a well known example of a modern agnathan.
Look at this specimen and notice the lack of a jaw.
The fossil shows clear agnathan characteristics.
I wonder if the early agnathan species were primarily scavengers.
Hagfish are considered the most primitive agnathan vertebrates.
Is an agnathan technically a fish if it has no jaws?
Is an agnathan technically a fish if it has no jaws?
The researcher focused on the agnathan lineage to understand vertebrate evolution.
The researcher focused on the agnathan lineage to understand vertebrate evolution.
These ancient agnathan creatures lacked paired fins.
These ancient agnathan creatures lacked paired fins.